Valve



(No Model.)

G. T. WILSON.

VALVE.

No. 359,948. Patented Mar. 22, 1887.-

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UNITED STATES PATENT OErinE.

GEORGE T. \VILSON, OF BOSTON, ASSIGNOB OF ONE-HALF TO JULIAN DESTE, OFSALEM, MASSACHUSETTS.

VALVE.

SPECIFICATION forming part of Letters Patent No. 359,948, dated March22, 1887.

Application filed January 8, 1887. Serial No. 223,767. (No model.)

To all whom it may concern.-

Be it known that'I, GEORGE 'I. WILsoN, of Boston, in the county ofSuffolk and State of Massachusetts, have invented a new and usefulImprovement in Valves, of which the following is a specification.

The object of the invention is to provide a valve apparatus to regulatethe passage of liquids, (especially water,) so arranged that the liquidmay pass through the valve-seat to the outlet-pipe until theback-pressure of the liquid exerts the maximum pressure it is desiredthat it should exert and tends to rise above it, and that then theliquid shall cease to pass through.

In my invention the valve-seat has a prolongation provided with a portor ports, preferahly the latter, around which the valve fits tightly, inorder that the liquids shall not act upon the inner area of the valve,and in order that when the valve is raised said ports shall he open toadmit the passage of the liquid through the valve-seat to theoutlet-pipe, and in order that the valve may be shut by backpressure ofthe liquid upon the outer area of the valve and close around said portsand prevent the passage of the liquid through the valve-seat when theback-pressure exerts the maximum pressure it is desired that it shouldexert and tends to rise ahoveit.

In the drawings, Figurel represents in elevation an apparatus embodyingmy invention, the valve-case G and the cover U to the valvestem andspring being shown in sect-ion. Fig. 2 represents a sectional elevationof the apparatus shown in Fig. 1.

G is the valve-case, which has the inlet A for the admission and theoutlet B for the exit of the liquid. The valve-seat 'I has theprolongation G, which is provided with the ports P. The valve-seat hasthe gasket H, and the prolongation G of the valve-seat has the cupwasher\V and the cup-washer cap F, which latter has the square hole 0, toreceive awreneh or key to screw the valve seat to the valve-case.

R the valve-stem, which passes through the valve-case cap K, and carriesthe spring S and spring-compressing nut N, and is hollow part way,opening into the valve V, and having an opening, E, above the cap K, toadmit of the passage of air from the valve when the valve closes. Thecap K is provided with a boss, J, to keep the valve from close contactwith the cap K, in order that there may be an 5 outer area, L, of thevalve exposed for the liquid to press upon and balance the valve againstthe lifting force of the spring S, and shut the valve and close theports I? of the valve-seat when the back-pressure upon the area L of thevalve exerts the maxi mum pressure desired and tends to rise above it.

The operation is as follows: The compressing-nut. N is turned againstthe spring S, the spring being compressed thereby and the valve raised.The spring is compressed until the lifting force exerted by it upon thevalve is sufiicient to keep the valve raised against the back-pressureof the liquid on the outer area, L, of the valve until such pressure hasreached the maximum pressure desired and tends to rise above it, when itforces the valve down, air in the valve passing out through the hollowin the valve-stem, and causes the valve to close the ports I? and shut0d the passsage of 7 the liquid through the valve-seat, the valveremaining closed so long as the back-pressure upon the area L of thevalve exerts the maximum pressure desired.

I claim- In a valve apparatus, the combination, with a valve-seat havinga prolongation provided with a port or ports, of a valve provided withan outlet for air, said valve being kept raised by a force equal to themaximum hack-press S ure desired, and being closed by the backpressurewhen such pressure exerts the maximum pressure desired and tends to riseabove it, substantially as described, for the purpose specified.

GEORGE T. WILSON. Witnesses:

WliLDRoN Barns, JULIAN DEsTE.

